#cover_all{position:fixed;top:0;left:0;width:100%;height:100vw;background-color:rgba(0,0,0,.5);z-index:200}#ask_back{width:30%;height:20vh;position:fixed;background-color:#fff;left:35%;top:40vh;z-index:201;box-shadow:2px 2px 6px #000}#ask_back_question{padding:10px}.ask_back_answer{position:fixed;top:50vh;color:#00f;cursor:pointer;height:10vh;width:15%;z-index:22;line-height:10vh;text-align:center}.ask_back_positive{left:35%}.ask_back_negative{left:50%}